I have battled with my conscience over whether I should actually send this letter.

我备受良心的煎熬，不知是否真的应该把这封信寄出去。

What if he got a guilty conscience and brought it back?.

要是他觉得内疚，把东西拿回来了怎么办？

I could go away again with a clear conscience.

我可以问心无愧地再次离开。

He refused for reasons of conscience to sign a new law legalising abortion.

他出于信仰，拒绝签署使堕胎合法化的新法。

...the law on freedom of conscience and religious organizations.

有关信仰自由和宗教组织自由的法律

I'm so glad he had a pang of conscience.

我很高兴他会有负疚感。

They have shown a ruthless lack of conscience.

他们没有表现出丝毫内疚，实在是太无情了。

She could not, in good conscience, back out on her deal with him.

凭良心她不能背弃与他达成的协议。

Now the murderer has two deaths on his conscience.

现在，这个杀人犯背着两条人命，受到了良心的谴责。